Finding the Fourth Proportional to 2,087.50, 2,880.72 and 1,203.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,087.50 : 2,880.72 = 1,203.40 : x
2. Step 2: Convert to fraction form
   2,087.50/2,880.72 = 1,203.40/x
3. Step 3: Cross multiply
   2,087.50x = 2,880.72 × 1,203.40
4. Step 4: Simplify right side
   2,087.50x = 3,466,658.45
5. Step 5: Solve for x
   x = 3,466,658.45/2,087.50
6. Step 6: Final answer
   x = 1,660.67